4.6 Article

Boosting lithium rocking-chair engineering from the villus cavity and Ni catalytic center of a silicon-carbon anode for high-performance lithium-ion batteries

Journal

JOURNAL OF MATERIALS CHEMISTRY A
Volume 11, Issue 20, Pages 10776-10787

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d3ta00222e

Keywords

-

Ask authors/readers for more resources

In this study, nickel nanoparticles (Ni NPs) were used as a catalyst to induce the growth of villus cavity carbon nanotubes (CNTs) inside N-doped hollow carbon nanofibers (NHCF), which were attached to active silicon nanoparticles (Si NPs), forming an adaptive conductive and mechanical carbon network (Si@Ni-CNTs@NHCF). The Ni catalytic activity of Ni-CNTs contributed to the balanced behavior of lithiation and de-lithiation, improving the structural compatibility and long-cycle stability of the electrode. The findings deepen our understanding of structural modification for stable lithiation and de-lithiation cycling processes for Si/C anodes.
Generally, the dynamic silicon nanoparticles (Si NPs) cores and static carbon shells of silicon-carbon anode materials mismatch all through the lithiation and de-lithiation of high-capacity Li-ion batteries (LIBs). Herein, we used nickel nanoparticles (Ni NPs) as a catalyst to induce the growth of villus cavity carbon nanotubes (CNTs) inside N-doped hollow carbon nanofibers (NHCF), which was firmly attached to active silicon nanoparticles (Si NPs), building an adaptive conductive and mechanical carbon network (Si@Ni-CNTs@NHCF). The high conductivity of the crustaceous NHCF of Si@Ni-CNTs@NHCF facilitated the carrier transfer. Moreover, the compact villus cavity formed by Ni-CNTs could buffer the volume fluctuations of Si NPs and maintain a conductive connection with the expanding/contracting Si NPs during the charge/discharge process. More importantly, the Ni catalytic activity of Ni-CNTs contributed to the balanced behavior of lithiation and de-lithiation for the improvement of structural compatibility and the long-cycle stability of the electrode. Notably, Si@Ni-CNTs@NHCF, with the current density of 1 A g(-1), had a high reversible capacity of 1072 mA h g(-1) after 1000 extremely long stable cycles. This work deepens our understanding of the structural modification of Si/C anodes by constructing a compatibly conductive, mechanical and catalytic material to achieve stable lithiation and de-lithiation cycling processes.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available